02108nas a2200277 4500008004100000022001400041245013500055210006900190260009500259300001200354490000800366520111500374653001301489653001301502653001101515653001001526653002001536653001801556653001901574653001701593653001501610100002701625700001901652700002801671856013101699 2007 eng d a0021-951700aCopper(II) ion exchanged A1SBA-15: a versatile catalyst for intermolecular hydroamination of terminal alkynes with aromatic amines0 aCopperII ion exchanged A1SBA15 a versatile catalyst for intermol a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcSEP a274-2820 v2503 a

The hydroarnination reaction offers a very attractive route for the synthesis of alkylated amines and their derivatives with no byproduct formation. AISBA-15 was synthesized by isomorphous substitution of aluminum into the framework of SBA-15, which induces the Bronsted acid sites, and these were exchanged with metal ions such as Cu2+, Zn2+, and Pd2+. The catalysts were characterized by XRD, N-2-sOrption, SEM, TEM, acidity measurements by FT-IR pyridine adsorption, H-2-TPR, (27)AI MAS NMR, and Si-29 MAS NMR. Hydroamination of phenylacetylene (PhAc) with 2,4-xylidine has been used as a test reaction, which gave N-(1-phenylethylidene)-2,4-dimethylaniline with no byproduct formation. CuAlSBA-15 and CuAIMCM-41 showed around three times greater activity in hydroamination of PhAc compared with Cu-clay and Cu-beta, due to the moderate Lewis acidity of Cu2+ present in mesoporous supports. The performance of the CuAlSBA-15 was also determined with different alkynes and amines to evaluate the catalyst's general applicability in hydroamination reactions. (c) 2007 Elsevier Inc. All rights reserved.

10aA1SBA-1510aaddition10aalkyne10aAmine10aCopper catalyst10aheterogeneous10ahydroamination10aion exchange10aMesoporous1 aShanbhag, Ganapati, V.1 aJoseph, Trissa1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/copperii-ion-exchanged-a1sba-15-versatile-catalyst-intermolecular-hydroamination-terminal-002095nas a2200289 4500008004100000022001400041245016000055210006900215260007300284300001000357490000800367520107900375653001301454653002101467653001301488653001301501653001301514653001001527653002001537653001301557653001901570653001501589100002701604700001901631700002801650856012701678 2008 eng d a1381-116900aChemoselective synthesis of beta-amino acid derivatives by hydroamination of activated olefins using AISBA-15 catalyst prepared by post-synthetic treatment0 aChemoselective synthesis of betaamino acid derivatives by hydroa aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a16-230 v2843 a

beta-Amino acid derivatives have a wide variety of applications viz. in the synthesis of peptide analogues, precursor for amino alcohols, optically active amino acids, lactums and diamines. Chemoselective anti-Markovnikov hydroamination reaction of activated olefins was effectively used to synthesize beta-amino acid derivatives using AlSBA-15 and AlMCM-41 catalysts. These catalysts with different Si/Al ratios were synthesized by isomorphous substitution of aluminium into the framework of SBA-15, which induces the Bronsted and Lewis acid sites. The structural integrity of the catalysts was established by characterizing with XRD, N-2-sorption, TEM, NH3-TPD Al-27 MAS NMR and Si-29 MAS NMR techniques. Hydroamination of ethyl acrylate with aniline was used as a test reaction, which gave N-[2-(ethoxycarbonyl)ethyl] aniline with high selectivity. The performance of AlSBA-15 catalyst was also determined with different acrylates and amines to know the general applicability of the catalyst in hydroamination reactions. (C) 2008 Elsevier B.V. All rights reserved.

10aacrylate10aactivated olefin10aaddition10aAlMCM-4110aAlSBA-1510aAmine10abeta-amino acid10aCatalyst10ahydroamination10aMesoporous1 aShanbhag, Ganapati, V.1 aKumbar, S., M.1 aHalligudi, Shivaraj, B. uhttps://library.ncl.res.in/content/chemoselective-synthesis-beta-amino-acid-derivatives-hydroamination-activated-olefins-002006nas a2200205 4500008004100000245010800041210006900149260000800218300001000226490000800236520125100244100002501495700003001520700002101550700002001571700002801591700002301619700002701642856013101669 2018 eng d00aMesoporous tin oxide: an efficient catalyst with versatile applications in acid and oxidation catalysis0 aMesoporous tin oxide an efficient catalyst with versatile applic cJUL a61-760 v3093 aMesoporous tin oxide was prepared by template assisted and template-free methods. As-prepared materials were calcined at various temperatures to generate different nature (Bronsted and Lewis), amount and strength of acidic sites. The physico-chemical properties of the catalysts were studied by XRD, N-2 sorption, pyridine-FTIR, NH3-TPD, DRS UV-vis, TGA, SEM, TEM, H-1 MAS and Sn-119 MAS NMR analyses. The catalytic behavior of mesoporous tin oxide catalysts was evaluated for acetalization and ketalization of glycerol with benzaldehyde and acetone respectively under solvent free conditions. The catalytic performance of mesoporous tin oxide was compared with that of other conventional solid acid catalysts namely H-ZSM-5, H-mordenite, H-beta, Al-MCM-41, Al-SBA-15 and Al-TUD-1. The efficiency of mesoporous tin oxide was also tested for cyclohexene epoxidation reaction. The catalyst prepared by template assisted method showed excellent catalytic performance compared to other catalysts due the difference in nature and amount of acidic sites in the catalyst. Meso-SnO2-T-350 was stable and reusable catalyst for four cycles without any appreciable loss in activity, and therefore it offers a good catalyst for potentially wide applications.1 aManjunathan, Pandian1 aMarakatti, Vijaykumar, S.1 aChandra, Prakash1 aKulal, Atul, B.1 aUmbarkar, Shubhangi, B.1 aRavishankar, Raman1 aShanbhag, Ganapati, V. uhttps://library.ncl.res.in/content/mesoporous-tin-oxide-efficient-catalyst-versatile-applications-acid-and-oxidation-catalysis12211nas a2200289 45000080041000000220014000412450146000552100069002012600008002703000011002784900008002895201119900297653001111496653000811507653005211515653002111567100002011588700002311608700003011631700002511661700001911686700002211705700001811727700002111745700002711766856012811793 2021 eng d a1385-894700aGreen route for carbonylation of amines by CO2 using Sn-Ni-O bifunctional catalyst and theoretical study for finding best suited active sites0 aGreen route for carbonylation of amines by CO2 using SnNiO bifun cSEP a1294390 v4193 a

Reaction between n-alkylamine and CO2 has gained interest due to the demand for the dialkylurea for various applications. For the first time, the tool Mathematica was used to analyze the experimental data with an idea to derive an equation which determines the best suited active sites for any given input set of dependent parameters. The equation can further be used to predict the product yield with the known values of active sites for a reaction. Among several Sn containing mixed oxides, Sn-Ni oxide (Sn-Ni-O) was found to be the better performing catalyst. The studies indicate that the formation of new defect sites when NiO and SnO2 are in the mixed state and possibly a solid solution enhances the catalytic efficiency. There are two main reasons for improved catalytic performance; one, mixing of SnO2 into NiO which reduces the number of holes (h+) localized on lattice oxygen (O2−+ h+→ O•−) and two, smaller SnO2 particles are dispersed on the bigger particle NiO which alters the acidic and basic active sites in the catalyst. FT-IR adsorption study with amine and CO2 helped in deriving a plausible mechanism for this reaction. Under optimized reaction condition, Sn1.1-Ni-O-600 gave 77.3% of n-butylamine conversion and 75.7% of yield for 1,3-dibutylurea. The versatility of the catalyst was tested for carbonylation of different aliphatic and aromatic amines, diamine and hydroxy amine with CO2.

10aamines10aCO210aMixed oxide catalyst and bi-functional catalyst10aSubstituted urea1 aKulal, Nagendra1 aVetrivel, Rajappan1 aGopinath, Chinnakonda, S.1 aRavindran, Rahul, K.1 aRao, Vinod, N.1 aShetty, Manjunath1 aShrikanth, R.1 aRangappa, Dinesh1 aShanbhag, Ganapati, V. uhttps://library.ncl.res.in/content/green-route-carbonylation-amines-co2-using-sn-ni-o-bifunctional-catalyst-and-theoretical